linux-kernel - [PATCH] sysrq: add debug message to reboot event

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Message-ID: <4A89AC97.6030109@oracle.com>
Date:	Mon, 17 Aug 2009 12:16:39 -0700
From:	"tina.yang" <tina.yang@...cle.com>
To:	linux-kernel@...r.kernel.org
CC:	Jiri Kosina <trivial@...nel.org>
Subject: [PATCH] sysrq: add debug message to reboot event

Add debug message to detect keyboard vs non-keyboard
triggered sysrq-b events.

Signed-off-by: Tina Yang <Tina.Yang@...cle.com>
Signed-off-by: Zach Brown <Zach.Brown@...cle.com>

---

--- linux-2.6.git/drivers/char/sysrq.c.orig     2009-08-13
15:43:34.000000000 -0700
+++ linux-2.6.git/drivers/char/sysrq.c  2009-08-13 21:51:15.832694000 -0700
@@ -135,17 +135,22 @@ static struct sysrq_key_op sysrq_crash_o
        .enable_mask    = SYSRQ_ENABLE_DUMP,
 };

-static void sysrq_handle_reboot(int key, struct tty_struct *tty)
+static void sysrq_handle_reboot(int check_mask, int key, struct
tty_struct *tty)
 {
+       if (check_mask)
+               printk("<keyboard-invoked>\n");
+        else
+               printk("<non-keyboard-invoked: PID %d COMMAND %s>\n",
+                               current->pid, current->comm);
        lockdep_off();
        local_irq_enable();
        emergency_restart();
 }
 static struct sysrq_key_op sysrq_reboot_op = {
-       .handler        = sysrq_handle_reboot,
-       .help_msg       = "reBoot",
-       .action_msg     = "Resetting",
-       .enable_mask    = SYSRQ_ENABLE_BOOT,
+       .handler_with_mask      = sysrq_handle_reboot,
+       .help_msg               = "reBoot",
+       .action_msg             = "Resetting",
+       .enable_mask            = SYSRQ_ENABLE_BOOT,
 };

 static void sysrq_handle_sync(int key, struct tty_struct *tty)
@@ -509,7 +514,10 @@ void __handle_sysrq(int key, struct tty_
                if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
                        printk("%s\n", op_p->action_msg);
                        console_loglevel = orig_log_level;
-                       op_p->handler(key, tty);
+                       if (op_p->handler_with_mask)
+                               op_p->handler_with_mask(check_mask, key,
tty);
+                       else
+                               op_p->handler(key, tty);
                } else {
                        printk("This sysrq operation is disabled.\n");
                }
--- linux-2.6.git/include/linux/sysrq.h.orig    2009-08-13
20:53:48.085786000 -0700
+++ linux-2.6.git/include/linux/sysrq.h 2009-08-13 20:54:12.625756000 -0700
@@ -32,6 +32,7 @@ struct tty_struct;

 struct sysrq_key_op {
        void (*handler)(int, struct tty_struct *);
+       void (*handler_with_mask)(int, int, struct tty_struct *);
        char *help_msg;
        char *action_msg;
        int enable_mask;

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